One would assume that their own people are already quite experienced in Objective C, and there is little benefit to them in switching to Swift. As long as Apple

One would assume that their own people are already quite experienced in Objective C, and there is little benefit to them in switching to Swift. As long as Apple keeps supporting Objective C, why should the people already proficient in it change? It just isn't practical. However, Swift is invaluable in attracting new developers who are unlikely to take up Objective C.